oeqa/oetest.py: add better package search for hasPackage()

Modified hasPackage() to split the content of pacakage manifest file
in containing lines and search at the begining of each line the
existance of the needed pkg.

[YOCTO #8170]

(From OE-Core rev: f07045fcae859c902434062d1725f1348f42d1dd)

Signed-off-by: Costin Constantin <costin.c.constantin@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/oetest.py

@@ -99,9 +99,9 @@ class oeTest(unittest.TestCase):
 
     @classmethod
     def hasPackage(self, pkg):
-
-        if re.search(pkg, oeTest.tc.pkgmanifest):
-            return True
+        for item in oeTest.tc.pkgmanifest.split('\n'):
+            if re.match(pkg, item):
+                return True
         return False
 
     @classmethod